Chuck operating means



Maur-ch 1932. A. E. CHURCH CHUCK OPERATING MEANS Filed NOV. `l2, 1950 3 Sheets-Sheet m w w @9i/Immo i7 y v Y fafh, E. A E CHURCH 1,848,311?

. Y CHUCK GPERATING MEANS Filed Novv l2. 1950 3 Sheets-Sheet 2 @mmm/toa vx f if' a March 8, 1932. A E CHURCH ,848,317

CHUCK OPERATING MEANS Filed Nov. 12. 195o 3 Sheets-Sheet, 5

IIIIHIII IH IH? Y nisms for chucks such as those commonlyk Patented Mar. 8, 1932 f PATeN-rgoFFi-ce l ALBERT R. CHURCH, or New BRITAIN, CONNECTICUT, AssIeNoR To THE UNION `Ivraigmn FACTURING coMrANY, vor NewV BRITAIN, coNNRcTIcUnA:coRroRATioN or N- NEcTIcUT 1 y CHUCK OPERATING MEANS Appncannafiea November 12,19301- serial No; 495,261.'

The invention relates to operating kmechaused upon metal lathes, broaching machines and-the like-' such machinesgthe chuck `iscarried byk-a tubular spindleV mounted 1n the n head stock of the machine, a longitudinally shiftable rod is disposed within the spindle 1 and connected with'the chuck or opening or remote from the chuck'foreffecting V'the lonf closing the. chuck jaws whenthe rod isflongi- .Y {tudinally shifted in theproper d1rect1on, and f means Vare provided at the end of Lthe spindle gitudinalshifting of said rod.

vIt is one .object of my invention to provide Ya-generally` improved and simpliiied,yet

an unusually eflicient structurey for longitudinallyshifting ,the yabove-named rodV to effect jaw-opening and closing.

VIt is another object of the invention to provide a chuck-operating rod of longitudmally resilient form, whereby after shifting said rodto engage the chuck jaws with the vwork, the rod-shifting means K. will longitudinally stress the resilient rod, with the` result that "1f the jaw teethi'urtherpenetrate the work during operation of the machine, the resilij `enoy ofthe rod will come intoplay toeiect further jaw-movement, thus insuring that i the work shall'still be tightlyheldiii 3ok resides in the novel subject matter hereinafter described and claimed, description be- With the foregoingin view,`l the invention lng accomplished by reference .tothe accompanying drawings;

Fig. 1 is a perspectiveview of ka' portion of the fiat turret lathe embodying the invention.

Fig. 2 is a longitudinal sectional view part- 1 ly in elevation, showing the'tubular spindle,

thejaw-operating rod passing therethrough, the chuck 'on 'one'end1 oil the spindle, yand the y` mechanism onthe' other end of said spindle `for eecting rod shifting.k

Fig. 3 is an enlarged longitudinal sectional view through the rod-shifting mechanism.

Fig. 4 is avertical transverse sectionalview on line 4 4 of Fig. 3.

5 is a similar view `Online 5 5 of A, Hat turret lathef is showne'mbodying the usual tubular spindle 7, one end of which is provided ,with a Vchuck 8 having conventional jaws 9. a A rod 10 is disposed within the spindle ,7 and ,is operatively connected with the' jaws 9-or moving theminwardly whenrthe rod'is moved inV one direction, and outwardly :when said rod is movedv inthe other direction. In the present showing, the

chuck 8 'embodies `levers 11 for moving the jaws 9, the inn'e'rends of said levers '11 being f k7,no other meansfwillbe necessary` for rthis purpose. `However, in the present disclosure,

'the connection 181is threaded and henceit is advisable to provide means forholding the rod y10 against rotation with .respectA to theV spindle. Forthis purpose, a sleeve 14' has been shown, secured within the endv of the spindle 7 remote from the chuck 8,'saidsleeve having a key 15 slidably received in a keyway/'116 in the rod 10. A'screw 17 kisshown for securing the sleeve 14 in the spindle 7, and this screw performs a urthergfunction here-v inater described., l, i

' drum is mounted upon the'end of the spindle 7 1 remote from the chuck 8, said drum containing means orshifting'mthe rod 10in either direction;Y kThis drum', inthe y,present showing, embodies two sections 18 4and'19.

'The' drum section 18 is provided withaclosed end 20, with'ian open end 21 and with a continuous peripherallvwall 22. The end 2O is provided 'with a hub 23 vwhich, is threaded uponthe spindle 7, said hub'having an opening 24 throu'ghwhich the screw 17 passes,

'Y so that this screw locks the hub upon the spinll dle. The wall 22 is providedwith spaced ribs l'25 andthe `area between 'these ribs constitutes a pulley kfor engagement with a conventional spindle-driving belt 26. V

, rihe drum section 19 embodies a closed end 27, an open end 28 and a continuous peripheral wall 29." The closed end 27 Yofthe drum section 19 is provided with a rigid bearingV 30 which projects vcentrally into thedrum section-18, Aand the openend y28 of said drum sectionlQ., is closed by an annulark end' wallk 1 itt v Suitable means such as screws 32, are employed for securing the two drum sections 18 and 19 and the end wall 31 in the assembled relation shown most clearly in Fig. 3. A ktubular nut 33 is rotatably mounted in the bearing 30, main bearings 34 and 35 and end thrust bearings 36, all of anti-friction nature, being provided for said nut. The interior of this nut` has a threaded engagement With the threaded end 370i the rod 10, so that `when said nut 33 is rotated in one direction with respect to the drum, rod 1.0 will be shifted in one direction, whereas reverse movement of said rod is effected by reverse rotation of said nut. n

i he end'of the nut33 most remote from the rod 10, is provided witha` rigidly attached vdisk 3S disposed within the drum section 19.V

internal gear ring 39 is secured to the disk 38 by appropriate means 40', and a Vsecond internalfgear ring 41 is secured against tric motor 4G or other appropriate contrivance whereby said4 gear 44 may 4be driven. The `casinl of the motor` or the 'like 46 isl se- 'vcured to t eannular end ,wa-ll'l3`1, by any appiopriate means such as the'screivs 47.L

yVthcn the motor or the like 46 drives the sun lgear 44 in one directiom'the planet gear 43 is driven and rollsaround the inner periphery ofthe ring gear 41, the difference in rvthe teeth of the .two gears ,41'and 39, causing thelatter tobe slowly driven, withtlie result ythat the disk '38 and nut 33 narealso driven, l thus causing said nut to eifectmovement of vthe rod 10 in onedirection or'thevother. Reversalfof the motor or the like 46causesthenut-drivin'gmechanisin to vrotate the, nut 33 in the reverse direction,ther'eby moving the rod lOLin the opposite direction from" the iirst describedmovement. l n

' The lrodlO'is rendered longitudinallyresilient, by providing it vwithv transverse, peripheral notches' 48 which are disposed in staggered relation, all of said notches extending inwardly 'past the longitudinal center li'ne of the rod. Hence, the notched portion kof the rod may either stretch or'compress longitudinally to a limited extent,'it being of course understood that steel ofl proper qual it isflsed in the construction of this rod. 'Ven'the rod'is' moved by thefnut 33'to4 coni tract the chuck jaws'9fa`ga'inst the A"Work,

movement' of said -jaws is restricted by engagement of their conventional teeth 9 with the work. In the present showing, this aw contraction takes p ace when rod 10 is pu led vaway from the chuck 8, and as soon as the tract the jaws 9, should their teeth 9 bitey further into Ythe work during operation of the machine. Thus, instead of allowing the work to loosen in the chuck as now often occurs, it is insured that the jaws shall remain inY tight gripping engagement with the work. Excel nt results have been obtained from -tire-general construction shown and described yand'such construction is 'therefore preferably followed. However, within thescopo of the invention as claimed, numerous variations may be made, and while the invention is Shown in'conne'ction with a chuck, it may be fused also'with other adequate work holders.

Furthermore, the vrod 10 may be Atubular if :desired-and may be rendered longitudinally vresilient by ymemis'i'o'ther than the notches v48. I claim 1. In a chuck operating means, a bearing adapted toibe axially alined with and carried 'bythe end offa 'chuck-carrying spindle remote frmthechuck, atubular nut rotatably mounted in said bearing, a chuck-operating rod threaded in and extending from one end of said nut for connection with the chuck,

Aan internal gear ring disposed at the other end ofthe nut and rotatable bodily therewith,

asecondf'internal gear ring opposed to the gear 'meshing with said planet gear, and means for rotating said sun-gear.

2. In a chuckfoperating means, a drum adapted to beiaxia'llyalined with and carried 'by 'theend of a lchuck`carrying spindle remote from the chuck, said drum having any internal'bearingv Aco-axial therewith, a tubular *tint rotatably mounted in said bearing, a 'chuck-operating rod'threaded into said nut and extending from one end thereof for con- -nec'tionwith the chuck,`an internal gear ring disposed at y'the other end of lsaid nut 'and 'rotatable'bodily therewith, a second internal `gear ring opposed Vto the lirst named ring and secured in said drum to rotate with the 'latter, saidgear rings being ofthe same internal -'diameter buthaving slightly *differ`- ent numbers of teeth, aplanet gear meshing with both of saidfring'gea'rs, a sun gea meshing with said planet gear, and driving means for said sun gear mounted on one end ofy vsaid drum.

B. In a chuck operating means, a drum y. section having a closed end, an open end and a continuous side wall, said closed end being provided with a hub for connection with the end of a chuck-carrying spindle remote from the chuck, a second drum section having an open end, a closed end and a continuous side wall, said closed end of thev second drum section closing said open end of the rst named drum section and having a central bearing extending into the latter, an annular end wall for said second drum section, means securing said end wall and said .drum sections in assembled relation, a tubular nut rotatably mounted in said bearing and having a rigidly attached disk in saidsecond drum section, two opposed internal gear rings in said second drum section secured to said disk andsaid end wall respectively, said gear rings beingof uniform internal diameter but having slightly diierentV numbers of teeth, a planet gear insaid second drum section meshing with both of saidring gears, a sun ,gear in said second drum sectionmeshing with said planet gear, and driving means for said sun gear having a casing secured to said end wall. s LA structure as .specied inl claim l; together with a sleeve around said rod `and means for securing said sleeve in the spindle, said sleeve and rod having slidably engaged means for'holding. ytherod against turnin with respect tothe sleeve. f

5. ln a chuck having work-gripping jaws, an elongated stiff spring adapted when stressed in one direction to exert a yforce to hold said jaws tightly engaged with the work, means operatively connecting one end of said spring with said jaws, and means connected with the other end of saidv springrfor positively moving said other end longitudinally in one direction to stress said spring andefect jaw application, and for positively movtion to eiiect jaw release.

6. ln a chuck, a tubular spindle, achuck head on one end ofjsaid spindle, spring-stressing means at the other end of said spindle, manually-controlled power-actuated` means mounted on said other end of the spindle for actuating said spring-stressing means, workgripping jaws mounted on said chuck head,

' an elongated stid spring disposed longitudinally in said tubular spindle and operatively connected at one end with said spring-stressing means,and means operatively connecting the other end of said spring with said jaws for applying the latter when the spring is stressed and for releasing said jaws when the Y spring lis relieved of stress.

7. ln a chuck, a tubular spindle, a chuck head on one end of said spindle, a rotatable member co-'aXial with and disposed at thek movement longitudinally of said spindle, work-gripping jaws mounted on said head, a second relatively non-rotatable member having a threaded engagement with said rotatable member, an elongated stili. springk disposed longitudinally in said tubular spindle and operatively connected at one end with said second member to be longitudinally stressed by the latter, means operatively connecting the other end of said spring with said jaws to hold the latter in .work-gripping position wheny the spring is stressed, and

means for rotating said rotatable member tol threaded on said screw for longitudinally shitting said screw to stress and release the spring. f

10. An elongated chuck-operating rod having a co-axial integral lscrew. on one end, the part of said rod independent of said screw having longitudinallyy spaced transverse notches rendering it longitudinally resilient.

In testimony whereof I athx my signature.

f ALBERT E. CHURCH.;

Vlng said other springend in the other direcother end of said spindle, means mounting said rotatable member and holding it against 

